Rosemount 3051 vs Yokogawa EJA110E vs Siemens P320
Comparison / April 2026 / 9 min read / By Shengshi Engineering Team
Quick answer: Rosemount 3051, Yokogawa EJA110E and Siemens SITRANS P320 are established pressure-transmitter families, but they are not automatically interchangeable. Match the measurement type, calibrated range, wetted materials, process connection, output protocol, approvals and required documentation to the application.
When Rosemount 3051 Fits
Rosemount 3051 is a broad product family. For an RFQ, use the complete model code or nameplate because pressure type, range, process connection, materials, output and approvals vary by configuration.
When Yokogawa Fits
Yokogawa EJA110E is a differential-pressure transmitter family. Confirm capsule/range, wetted materials, flange and process connection, output protocol, housing and hazardous-area approvals against the datasheet and site requirement.
When Siemens Fits
Siemens SITRANS P320/P420 supports pressure-measurement configurations within the Siemens instrumentation portfolio. Check the exact measuring mode, range, materials, connection, communication and approval code before treating it as an alternative.
Comparison Summary
| Brand | Typical reason to choose | Procurement note |
|---|---|---|
| Rosemount 3051 | Standardized projects and broad availability | Confirm manifold, seal and protocol |
| Yokogawa EJA/EJX | Stability and demanding process industries | Check sensor range and diaphragm material |
| Siemens P320 | Siemens ecosystem and value projects | Confirm approvals and display options |
Emerson vs Siemens: separate the process output from local access
For Rosemount 3051 and SITRANS P320/P420, separate the required output to the control system from local maintenance access. Published communication options apply across each family; they are not all features of every transmitter.
| Integration task | Published option to investigate | Check before comparing configurations |
|---|---|---|
| Retain a 4–20 mA loop with HART communication | Both Rosemount 3051 and SITRANS P320/P420 list this option. | Confirm the exact output version and its electrical requirements against the existing loop. |
| Add a point using WirelessHART | Rosemount 3051 lists a selectable WirelessHART version. | Check the proposed instrument and the plant's wireless-system support together. |
| Connect to a PROFINET over Ethernet-APL network | Siemens lists this option for SITRANS P320/P420. | Confirm the selected device version and the site's network design; do not assume an existing analog connection is sufficient. |
Sources: Rosemount 3051 and SITRANS P320/P420. These positive examples are not an exhaustive comparison of either portfolio.
Emerson describes Bluetooth for configuration and maintenance, separately from the selectable WirelessHART process output. Bluetooth access alone does not establish WirelessHART output; check both features in the selected configuration.
An integration match does not establish equal measuring performance. Compare the same pressure task, range and operating conditions before comparing accuracy figures.
Procurement checkpoint: send the full model code, a clear nameplate photo and the process datasheet. Similar-looking transmitters can differ in calibrated range, wetted parts, flange, output and certification.
Need a Configuration Review?
Product and official references
- Rosemount 3051 product page — Emerson official product family
- Yokogawa EJA110E product page — Yokogawa official product page
- Siemens SITRANS P320/P420 product page — Siemens official product page
Pressure transmitter comparison FAQ
What information should I send for an RFQ?
Send the complete model code, nameplate photo, measurement type, calibrated range, process connection, wetted materials, output signal, quantity and required certificates.
Can these three transmitter families be treated as drop-in replacements?
No. Confirm measurement type, range, flange or process connection, wetted materials, output, approvals, mounting and site standard before considering a substitution.
How do I choose gauge, absolute or differential pressure?
The choice follows the measurement task: gauge pressure references atmosphere, absolute pressure references vacuum, and differential pressure measures the difference between two process points. The process datasheet should define the required type.
Does the same span mean the same 4–20 mA range?
No. For a linear, increasing 4–20 mA pressure output, record the lower range value (LRV, at 4 mA) and upper range value (URV, at 20 mA), with units and pressure reference. The span is URV minus LRV; it does not identify both endpoints.
For example, 0–100 kPa gauge and 50–150 kPa gauge both have a 100 kPa span. At 75 kPa gauge, their ideal outputs are 16 mA and 8 mA respectively. These are illustrative scaling calculations, not selected ranges for a particular model.
Check the replacement’s permitted range limits and the receiving system’s scaling against both endpoints. Yokogawa’s EJX/EJA-E manual, section 7.6.7, treats LRV and URV as configurable values subject to limits; section 7.6.9 separately addresses output mode. Square-root or other characterized outputs require their applicable conversion. This comparison is not a procedure for reranging or trimming an operating instrument.
Are certificates and documentation always available?
Documentation support depends on the exact model, configuration and sourcing route. List every required datasheet, drawing, calibration record or certificate in the RFQ for confirmation.
For a configuration review, send the model code or nameplate photo together with process data, quantity and document requirements.
Request a Configuration Review
Send the complete model code, nameplate photo or process datasheet. We will check the requested configuration and documentation scope before quotation.